Source suggestions for small spades

I use connectors from Anticable...https://anticables.com/speaker-wires/2-channel

Minimalist designs, pure copper. They even have "vintage" pure copper spades which I believe to be what you are looking for.

Of course, looking at how those connectors are attached to the chassis, it does kind of make you want to make new one's with banana plugs, don't it? :D

I have used these adapters with narrow width to fit old McIntosh and Fisher screws with dividers between screws

https://www.google.com/search?q=small+speaker+wire+adapters&sca_esv=60df094e8c3a7fc5&sxsrf=ACQVn08tkHqVmTEyQKE5TLWiYPoav4EZkA:1708010816482&source=univ&tbm=shop&tbo=u&biw=1280&bih=593&dpr=1.5#spd=624769687556198535

mine use set screws to fasten the wire to the adapter. choice of direction for wire entry

https://www.google.com/search?q=small+speaker+wire+adapters&sca_esv=60df094e8c3a7fc5&sxsrf=ACQVn08tkHqVmTEyQKE5TLWiYPoav4EZkA:1708010816482&source=univ&tbm=shop&tbo=u&biw=1280&bih=593&dpr=1.5#spd=8014896050538530367

Look at this eBay item:

Gold Speaker Spade Connector 8 PCS For Speaker Wire DIY New